Re: [Linux-ia64] Pre-emption patch for IA-64

Jesse Barnes
2003-03-14T21:32:13Z

Just FYI, I tried 2.5.64 out on my Bug Sur, and it seems to work ok
with the following exceptions:
o the AT keyboard support seems broken (characters are slow to show
up on the screen and are sometimes repeated)
o agp support for 460GX causes a link failure

But by using a USB keyboard and turning off agp support, I was able to
get an SMP+preempt kernel going, and it seems fine.

Jesse

On Fri, Mar 14, 2003 at 01:24:44PM -0800, David Mosberger wrote:
> Peter Chubb has been working on adding preemption support to 2.5. I
> applied his patch in the 2.5.64 patch. I'm sure he would appreciate
> more people beating on it.
>
> --david
>
> >>>>> On Fri, 14 Mar 2003 11:21:21 -0600, Mario Smarduch <cms063@email.mot.com> said:
>
> Mario> Hi, we're trying to build a reliable low-latency system for
> Mario> use in telco call processing carrier grade environments (on
> Mario> rx2600 NEBS like servers) . One of the patches we're heavily
> Mario> relying on is the 'Kernel Preemption' patch. First of we're
> Mario> interested in the (i) status of this patch on IA-64 (ii) any
> Mario> issues that you may have ran into.
>
> Mario> Our understanding is that the 'Preemption Patch' offers a
> Mario> systematic scheduling checkpoint vs. 'low latency patch'
> Mario> which examines the kernel for any long running code and based
> Mario> on that preemption checks are inserted in the kernel proper
> Mario> only (kernel.org) but addon packages may introduce long
> Mario> latencies. While we plan to run with 1mS clock tick, low
> Mario> latency and the preemption paches, the preemption patch is
> Mario> viewed as a must to gurantee a bound on 'soft-realtime
> Mario> response'. Please point out if these assumption are somewhat
> Mario> correct or is too much emphasis being placed on the
> Mario> preemption patch, the soft-realtime response we're looking
> Mario> for is 1mS.
>
>
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